CN102761955B - A kind of data transfer control method of multi-hop wireless network - Google Patents
A kind of data transfer control method of multi-hop wireless network Download PDFInfo
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Abstract
The invention provides a kind of data transfer control method of multi-hop wireless network, described wireless network comprises some radio nodes, each radio node has adjacent child node and/or adjacent father node, wherein: the described radio node down link data be adjacent between child node sends and uplink data reception is synchronous transmission; Described radio node is adjacent downlink data receipt between father node and uplink data is sent as synchronous transmission; Described radio node is adjacent the down link data that downlink data receipt between father node and this node be adjacent between child node and is sent as asynchronous transmission; Described radio node is adjacent the uplink data that uplink data reception between child node and this node be adjacent between father node and is sent as asynchronous transmission.Invention increases the efficiency of transmission of the data retransmission of multihop system, reduce the propagation delay time of system.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of data transfer control method of multi-hop wireless network.
Background technology
The network architecture of wireless system comprises centralized network and distributed multihop network etc.Centralized network general networking capacity is comparatively large, but owing to being limited to base station transmitting power, network coverage is generally within several kilometers; Distance between each node of distributed multihop wireless network is relatively short, each jumping can complete the message transmission rate more much higher than direct communication, make support high data rate equally in the end-to-end communication system of long distance, and along with the increase of network node, the coverage of network and flexibility also can increase thereupon, to some extent solve the problem that on-line file coverage is limited.
The network topology that wireless system adopts comprises pointtopoint topology, bus topology, Star topology, ring topology, tree topology, Mesh topological sum mixed topology etc.Application and the geographical environment of wireless system are depended in the selection of wireless network topology.Under the application scenarioss such as railway, Highways ', river alongshore, power line, mine, frontier defense, coast defence, tree-like or that recurrent network is topological multihop relay wireless communication system is adopted to have natural advantage.
In tree network topology as described in Figure 1, whole network only has a root node 101 (being positioned at the most top layer of network), one or more intermediate node 102, and one or more end-node 103.Each node except root node is only connected with a father node, but intermediate node can be connected with one or more child node.Each intermediate node is the child node of its even higher level of node, is again the father node of its next stage node simultaneously.
For multi-hop wireless network, data end-to-end propagation delay time is in a network the cumulative of each internodal propagation delay time.When multi-hop wireless network jumping figure is more, strictly must be controlled each internodal propagation delay time, the real time business such as speech and video can be supported to make network.Meanwhile, multi-hop wireless transmission system under the condition ensureing network transfer delay, must improve the efficiency of transmission of system.
In multihop network, radio node, except sending except the data of this node, also needs the data forwarded from its father node and child node.Node is transmitted to its child node by down-link reception from the data of its father node, and is transmitted to its father node by extended receiver from the data of its child node.When node carries out data retransmission, if the transfer of data stringent synchronization between each node, then when node and its father node and and its child node between channel capacity and business datum flow there are differences time, the wait time delay that data forward transmission between node will be increased, thus increase the propagation delay time of whole multihop network, and reduce system data forward efficiency.
The multi-hop wireless communication system that current support is tree-like or recurrent network is topological, as WiFi, WiMAX (802.16d, 802.16j) etc., does not all propose the simultaneous asynchronous data transmissions radio frame synchronization scheme for above-mentioned application.
The multi-hop wireless system built based on WiFi technology adopts single channel identical networking, namely the transmission of each node data adopts CSMA/CA mode to work in same frequency channels, internodal transfer of data is fully decentralized, does not have strict radio frames timing to guarantee each internodal efficiency of transmission.When nodes jumping figure is larger, cannot provide safeguard for the QoS such as throughput, time delay of broadband, real time business.
Based on the multihop network of WiMAX technology, in network, each node only has a wireless transmit/receive units, and be operated on Same Physical channel, each node and its father node and with cannot realize between its child node communicating and data retransmission simultaneously, thus increase data forwarding latency.When nodes is more in a network, system transfers time delay and efficiency of transmission cannot be protected.
Summary of the invention
Technical problem to be solved by this invention is the data transfer control method providing a kind of multi-hop wireless network, to reduce time delay, improves efficiency of transmission.
For solving the problems of the technologies described above, the invention provides a kind of data transfer control method of multi-hop wireless network, described wireless network comprises some radio nodes, and each radio node has adjacent child node and/or adjacent father node, wherein:
The described radio node down link data be adjacent between child node sends and uplink data reception is synchronous transmission;
Described radio node is adjacent downlink data receipt between father node and uplink data is sent as synchronous transmission;
Described radio node is adjacent the down link data that downlink data receipt between father node and this node be adjacent between child node and is sent as asynchronous transmission;
Described radio node is adjacent the uplink data that uplink data reception between child node and this node be adjacent between father node and is sent as asynchronous transmission.
To the invention solves in existing multihop system transmission plan between each node during simultaneous asynchronous data transmissions, the radio frame synchronization problem of the down link between adjacent node and up link, improve the efficiency of transmission of the data retransmission of multihop system, reduce the propagation delay time of system.
Accompanying drawing explanation
Fig. 1 is tree network topology structural representation.
Fig. 2 is the principle schematic of a kind of tree network broadband multi-hop wireless communication system according to the embodiment of the present invention.
Fig. 3 is a kind of recurrent network broadband multi-hop wireless network topological structure schematic diagram.
A kind of multi-hop wireless system simultaneous asynchronous data transmissions radio frame synchronization time diagram of Fig. 4 for providing according to the embodiment of the present invention.
Fig. 5 is the wireless node apparatus structural representation according to the embodiment of the present invention.
Fig. 6 is the local data transfer process schematic according to the embodiment of the present invention.
Fig. 7 is the upstream data process path schematic diagram according to the embodiment of the present invention.
Fig. 8 is the exemplary construction schematic diagram of a kind of tree network broadband multi-hop wireless communication system according to the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.In the examples below, be that as preferred embodiment, the present invention will be described using the multi-hop wireless network of the tree-like or topological composition of chain, but those skilled in the art are known, the present invention is equally applicable to the multi-hop wireless network formed with other topological form.
As shown in Figure 2, for the principle schematic of a kind of tree network broadband multi-hop wireless communication system according to the embodiment of the present invention, be made up of control desk and some radio nodes, be connected for wired or wireless between control desk with root node, adopt tree-like or chain wireless network connection between each node, each radio node has adjacent child node and/or adjacent father node.
Transfer control method of the present invention, its core concept is:
The described radio node down link data be adjacent between child node sends and uplink data reception is synchronous transmission;
Described radio node is adjacent downlink data receipt between father node and uplink data is sent as synchronous transmission;
Described radio node is adjacent the down link data that downlink data receipt between father node and this node be adjacent between child node and is sent as asynchronous transmission;
Described radio node is adjacent the uplink data that uplink data reception between child node and this node be adjacent between father node and is sent as asynchronous transmission.
Described radio node opens the uplink data reception be adjacent between child node immediately after completing the down link data transmission be adjacent between child node, and so repeatedly switches;
Described radio node is opened the uplink data be adjacent between father node immediately and is sent after completing the downlink data receipt be adjacent between father node, and so repeatedly switches.
Described radio node is adjacent the downlink data receipt between father node, comprises the steps:
Described radio node, after receiving the down link data from father node, judges whether to need this data retransmission to its adjacent child node according to the datum target address comprised in the valid data received;
If need to forward, then the down link these data being put into this node sends buffer queue; If do not need to forward and belong to the data of this node, then the processing locality unit of this transfer of data to this node is processed accordingly, concrete process comprises extracting data PSDU (physical protocol data unit) from receiving and Target id, and mails to the peripheral hardware of this section point.
The down link data that described radio node is adjacent between child node sends, and comprising:
If the down link of described radio node sends in buffer queue outgoing data, and the sending duration of outgoing data is no more than preset maximum value T
f_MAXtime, then down link is sent all outgoing data in buffer queue and send;
If the down link of described radio node sends in buffer queue outgoing data, and outgoing data sending duration exceedes preset maximum value T
f_MAXtime, then only down link is sent transmitting time in buffer queue and be no more than T
f_MAXpart outgoing data send;
If when the down link of described radio node sends in buffer queue and do not have outgoing data, then down link sends downlink synchronous signal, obtain down-going synchronous to make its child node.
Described radio node is adjacent the uplink data reception between child node, comprises the steps:
Described radio node, after receiving the uplink data from child node, judges whether to need this data retransmission to its adjacent father node according to the datum target address comprised in the valid data received;
If need to forward, then the up link these data being put into this node sends buffer queue; If do not need to forward and belong to the data of this node, then the processing locality unit of this transfer of data to this node is processed accordingly.
The uplink data that described radio node is adjacent between father node sends, and comprising:
If the up link of described radio node sends in buffer queue outgoing data, and the sending duration of outgoing data is no more than preset maximum value T
b_MAXtime, then up link is sent all outgoing data in buffer queue and send;
If the up link of described radio node sends in buffer queue outgoing data, and outgoing data sending duration exceedes preset maximum value T
b_MAXtime, then only up link is sent transmitting time in buffer queue and be no more than T
b_MAXpart outgoing data send;
If when the up link of described radio node sends in buffer queue and do not have outgoing data, then send uplink synchronizing signals by up link, obtain uplink synchronous to make its father node.
As shown in Figure 2, radio node comprises bidirectional nodes and unidirectional node two profiles state, unidirectional node only comprises a son to wireless transmit/receive units or a father to wireless transmit/receive units, only supports and the bidirectional data communication of descending and up link between its child node or father node; Bidirectional nodes has a son to wireless transmit/receive units and a father to Transmit-Receive Unit, support simultaneously and its child node and and its father node between the bidirectional data communication of descending and up link.
Wherein, down link is the link being dealt into its child node from father node, and up link is the link being dealt into its father node from child node; Son is to the reception of wireless transmit/receive units for the transmitting and up link that complete the down link between adjacent child node, and father is to the reception of wireless transmit/receive units for the transmitting and down link that complete the up link between adjacent father node.
Downlink data receipt between nodes and its father node and the down link data between this node and its child node send separate, are asynchronous transmission; Meanwhile, the uplink data between node and its father node send and uplink data reception between this node and its child node separate, be asynchronous transmission; But the radio frames stringent synchronization of the descending and up link between each node and its child node.
In network, the transfer of data of each node (except root node) is from the downlink transmission of father node, and each node is in down-link reception state when not receiving the effective radio frame signal from its father node.
Specifically, tree-shaped multihop network simultaneous asynchronous data transmissions radio frame synchronization method is divided into following components:
1, the radio frame synchronization of down link simultaneous asynchronous data transmissions
In network, the transfer of data of each node is from the downlink transmission of father node, and each node is in down-link reception state when not receiving the radio frame signal from its father node.
When the node in network receives the downlink wireless frame signal from its father node, and carry out the subsequent treatment of down link according to the signal in this radio frames and data:
1) comprise valid data in this radio frames, and these data need this node to be transmitted to its child node
This node needs from its father node the down link data being transmitted to its child node by what receive, and the down link putting into this node sends buffer queue.
2) comprise valid data in this radio frames, and these data do not need this node to be transmitted to its child node
The down link data from its father node that this node will receive, the high-rise processing unit being transferred to this node processes.
3) Determines that this node sends buffer queue to wireless transmit/receive units according to down link sends content
--have data pending when down link sends buffer queue, and the sending duration of outgoing data is no more than preset maximum value T
f_MAXtime, down link is sent all outgoing data in buffer queue and send;
--have data pending when down link sends buffer queue, and outgoing data sending duration exceed preset maximum value T
f_MAXtime, only down link is sent transmitting time in buffer queue and be no more than T
f_MAXpart outgoing data send;
--when down link transmission buffer queue does not have data pending, downstream transceiver sends downlink synchronous signal by down link, to allow its child node obtain down-going synchronous.
After the son of each node completes down link signal and data transmission to wireless transmit/receive units in network, be namely transformed into extended receiver state, to receive the uplink radio frame signal from its child node.
2, the radio frame synchronization of uplink asynchronous transfer of data
The radio frames of the uplink data transmission of each node in network and the downlink wireless frame synchronization of its father node, after namely node father completes the reception of downlink wireless frame to wireless transmit/receive units, namely start uplink signal and launch.
The content that uplink signal sends depends on that up link sends the state of buffer queue
--have data pending when up link sends buffer queue, and the sending duration of outgoing data is no more than preset maximum value T
b_MAXtime, up link is sent all outgoing data in buffer queue and send;
--have data pending when up link sends buffer queue, and outgoing data sending duration exceed preset maximum value T
b_MAXtime, only up link is sent transmitting time in buffer queue and be no more than T
f_MAXpart outgoing data send;
--when up link transmission buffer queue does not have data pending, father sends uplink synchronizing signals to wireless transmit/receive units by up link, to allow its father node obtain uplink synchronous;
--after the father of each node completes uplink signal and data transmission to transceiver in network, be namely transformed into down-link reception state, to receive the downlink wireless frame signal from its father node.
Fig. 3 is a kind of chain (tree-like special case) network broadband multi-hop wireless network topological structure example, and whole network packet is containing control desk, two unidirectional node (node N
0and N
4), three bidirectional nodes (node N
1, N
2and N
3).ANT
srepresent son to antenna; ANT
prepresent father to antenna.
Fig. 4 illustrates a kind of multi-hop wireless system simultaneous asynchronous data transmissions radio frame synchronization sequential.Wherein, except node 0, all the other each nodes all need to receive and forward from node N
0data, node N
2the local data produced are had to need to be transferred to node N
0(control desk), node N
1without the local data produced, only as via node.
In Fig. 4, parameter is defined as follows:
T
d0, T
d1be respectively node N
0with N
1between, node N
1with N
2between radio signal propagation time delay.
NnANT
s: the son of node Nn is to transmitting-receiving sequential corresponding to wireless transmit/receive units antenna
NnANT
p: the father of node Nn is to transmitting-receiving sequential corresponding to wireless transmit/receive units antenna
DL-T: down link sending time slots
DL-R: downlink received time slots
UL-T: up link sending time slots
UL-R: uplink receive time slots
TP: node data processing delay
DS: downlink synchronous signal
US: uplink synchronizing signals
DDn, m: m the downlink data block that node Nn transmits
UDn, m: m the uplink data block that node Nn transmits
As shown in Figure 4, down link and uplink signal transmission stringent synchronization between each node and its child node.As node N
0with N
1between the down link data data that send (DL-T) and receive (DL-R) and up link send (UL-T) and receive (UL-R) and transmit for stringent synchronization.Particularly, node N
1father to wireless transmit/receive units (corresponding N
1aNT
p) complete and node N
0between down-link reception (as DD
0,3) after open immediately uplink data send (as UD
2,1), node N
0son to wireless transmit/receive units (corresponding N
0aNT
s) complete and node N
1between extended receiver (as UD
2,1) after open immediately down link data send (as DD
0,4), so go round and begin again.
Downlink data receipt between each node and its father node and the down link data between this node and its child node send (realize son to data retransmission), and uplink data reception between node and its child node and between this node and its father node uplink data send (realizing father to data retransmission) and be asynchronous transmission.As node N
1with its father node N
0between downlink data receipt (DL-R) and node N
1with its child node N
2between down link data send (DL-T) transmit for asynchronous (asynchronous); And node N
1with its child node N
2between uplink data reception (UL-R) and node N
1with its father node N
0between up link data send (UL-T) transmit for asynchronous (asynchronous).Particularly, node N
1father to wireless transmit/receive units (corresponding N
1aNT
p) and node N
0between down-link reception with this node to wireless transmit/receive units (corresponding N
1aNT
s) and node N
2between downlink transmission without strict sequential order relation.
For improving the efficiency of transmission of system, the propagation delay time of reduction system, in native system, father needs to start uplink data transmission (UL-T) immediately after wireless transmit/receive units completes downlink data receipt (DL-R), and son needs to start down link data transmission (DL-T) immediately after Transmit-Receive Unit completes uplink data reception (UL-R).
For father to wireless transmit/receive units, when up link sends in buffer queue countless according to transmission, then father sends uplink synchronization signal to wireless transmit/receive units.As in Fig. 4, by node N
1father complete the downlink data receipt (DL-R (DD of the first frame and the second frame to Transmit-Receive Unit
0,1), DL-R (DD
0,2)) after, do not complete process in time owing to not receiving from the forwarding data of up link or the uplink data of reception, and without local data, its up link only sends uplink synchronization signal frame (UL-T (US)).
For son to wireless transmit/receive units, when down link sends in buffer queue countless according to transmission, then son sends downlink synchronization signal to wireless transmit/receive units.By node N
1son complete the uplink data reception (UL-R (UD of the 3rd frame to Transmit-Receive Unit
2,3)) after, due to the down link data (DL-R (DD received
0,4)) do not complete process (namely the TP time does not complete data receiver before the downlink transmission moment) in time, and without local data, its down link only sends downlink synchronization signal frame (DL-T (DS)).
Radio frame synchronization method between node of the present invention, can be applicable to the multi-hop wireless communication system that existing support radio node that is tree-like or communication link protection forms, can reduce time delay, improve efficiency of transmission; Meanwhile, embodiments of the invention also provide a kind of wireless node apparatus of improvement, and to support radio frame synchronization method provided by the invention further, it comprises data transmission control unit, son to wireless transmit/receive units and/or father to wireless transmit/receive units, wherein:
Sub to wireless transmit/receive units, for sending downlink data to adjacent child node; And receive upstream data from adjacent child node, and therefrom extract Physical Layer Service Data block (PSDU) and destination address is sent to described data transmission control unit;
Father, to wireless transmit/receive units, for sending upstream data to adjacent father node, and from adjacent father node downlink data receiving, and therefrom extracts Physical Layer Service Data block and destination address is sent to described data transmission control unit;
Data transmission control unit, for receiving up and/or down physical layer service data unit and correspondence thereof destination address to wireless transmit/receive units and/or father to wireless transmit/receive units from described son, and according to described destination address, forwarding control is carried out to the data received.
Described wireless node apparatus, can further include: local data processing unit, described data transmission control unit is delivered to for the input Data Concurrent received from the local peripheral hardware (such as make a video recording first-class video data acquiring and processing unit) of this node, and reception delivers to described local peripheral hardware from the Data Concurrent of described data transmission control unit
Wherein, described input data comprise the destination address of Physical Layer Service Data block and correspondence thereof, described data transmission control unit according to described destination address, by this input data retransmission to son to wireless transmit/receive units and/or father to wireless transmit/receive units; The corresponding data received is sent to described local data processing unit according to the destination address comprised in the data received by described data transmission control unit.
Specifically, radio node comprises bidirectional nodes and unidirectional node two profiles state, and unidirectional node comprises a son to wireless transmit/receive units or a father to wireless transmit/receive units, only carries out communicating or only communicating with its father node with its child node; Bidirectional nodes comprises a son to wireless transmit/receive units and a father to wireless transmit/receive units, supports the bidirectional data communication with its child node and father node simultaneously.
Wherein, son is used for the transmitting of down link and the reception of up link to wireless transmit/receive units, and father is used for the transmitting of up link and the reception of down link to wireless transmit/receive units.Down link is the data link from father node to its child node, and up link is the data link from child node to its father node.
Down link between adjacent node and the transfer of data of up link can adopt the method for synchronization, to improve link transmission efficiency.
As shown in Figure 5, be the wireless node apparatus structural representation according to the embodiment of the present invention, comprise a local data processing unit 10, data transmission control unit 11, son to wireless transmit/receive units 12 and a father to wireless transmit/receive units 13; Wherein, son comprises a son to access control and processing unit 120, son to physical layer (PHY) processing unit 121, son to radio frequency unit 122, son to antenna element 123 to wireless transmit/receive units 12, subly can be made up of one or more directional antenna to antenna element; Father comprises a father to access control and processing unit 130, father to physical layer (PHY) processing unit 131, father to radio frequency unit 132, father to antenna element 133 to wireless transmit/receive units 13.
Wherein, local data processing unit 10, son can be selected to be configured according to nodal function and kenel to wireless transmit/receive units 12 and father to wireless transmit/receive units 13, for the node not needing local data transfer, then can not configure local data processing unit 10; For unidirectional node, can only configuration to wireless transmit/receive units 12 or father to wireless transmit/receive units 13.
And the effect of data transmission control unit 11 be according to from son to access control and processing unit 120, father to the PSDU data of access control and processing unit 130, local data processing unit 10 and destination address thereof, determination data routing direction, is namely transmitted to respective handling unit or equipment by above-mentioned three control/processing units.
Sub to access control and processing unit 120, for controlling to the communication resource needed for physical layer processing unit described son; Receive the down physical layer service data unit and destination address thereof that come from data transmission control unit forwarding, and be sent to son to physical layer processing unit; And receive and come from son to the upstream data of physical layer processing unit, and therefrom extract Physical Layer Service Data block and destination address is sent to described data transmission control unit.
Son, to physical layer processing unit 121, comes from son to the down physical layer service data unit of access control and processing unit and destination address thereof for receiving, and is sent to sub to radio frequency unit after carrying out coded modulation; And reception comes from the upstream data of son to radio frequency unit, and be sent to son after carrying out demodulating and decoding to access control and processing unit.
Son, to radio frequency unit 122, comes from son to the downlink data of physical layer processing unit for receiving, and is converted into downlink radio-frequency signal and is sent to son to antenna element; And receive and come from son to the upstream radio-frequency signal of antenna element, and be converted to uplink baseband signal and be sent to son to physical layer processing unit;
Son, to antenna element 123, comes from the downlink radio-frequency signal of son to radio frequency unit for receiving, and is sent to adjacent child node; And receive upstream radio-frequency signal from adjacent child node, and be sent to son to radio frequency unit.
Father to access control and processing unit 130, for controlling to the communication resource needed for physical layer processing unit described father; Receive the upstream physical layer service data unit and destination address thereof that come from data transmission control unit forwarding, and be sent to father to physical layer processing unit; And receive and come from the downlink data of father to physical layer processing unit, and therefrom extract Physical Layer Service Data block and destination address is sent to described data transmission control unit.
Father, to physical layer processing unit 131, comes from father to the upstream physical layer service data unit of access control and processing unit and destination address thereof for receiving, and is sent to father to radio frequency unit after carrying out coded modulation; And reception comes from the downlink data of father to radio frequency unit, and be sent to father after carrying out demodulating and decoding to access control and processing unit.
Father, to radio frequency unit 132, comes from the upstream data of father to physical layer processing unit for receiving, and is converted into upstream radio-frequency signal and is sent to father to antenna element; And receive and come from the downlink radio-frequency signal of father to antenna element, and be converted to downgoing baseband signal and be sent to father to physical layer processing unit.
Father, to antenna element 133, comes from the upstream radio-frequency signal of father to radio frequency unit for receiving, and is sent to adjacent father node; And receive downlink radio-frequency signal from adjacent father node, and be sent to father to radio frequency unit.
As shown in Figure 6, be the local data transfer process schematic according to the embodiment of the present invention, idiographic flow is described below:
1) local data (comprising physical protocol data unit (PSDU) and Target id) is sent to data transmission control unit 11 from local data processing unit 10;
2) data transmission control unit 11 is according to the destination address (being included in the destination node ID in MACPDU) of local data, determines the transmission direction of local data:
If the Target id instruction local data of √ PSDU mails to father node:
Local data (comprising this PSDU and its Target id) is then mail to father to access control and processing unit 130 by ■;
The PSDU of local data and its Target id to be dispatched in different physical channels to access control and processing unit by ■ father to be transmitted respectively;
■ father to after the data in different physical channel respectively coded modulation, sends to father to radio frequency unit 132 to PHY processing unit 131, and and then be emitted to adjacent father node by father to antenna element 133;
If the Target id instruction local data of √ PSDU mails to child node:
Local data (comprising this PSDU and its Target id) is then mail to son to access control and processing unit 120 by ■;
The PSDU of local data and its Target id to be dispatched in different physical channels to access control and processing unit 120 and to transmit respectively by ■;
■ to after the data in different physical channel respectively coded modulation, sends to son to radio frequency unit 122 to physical layer processing unit 121, and and then be emitted to adjacent child node by son to antenna element 123;
Son to or father to the controlled system of access control and processing unit to or father to the physical layer radio resources communicated with between child node or father node needed for physical layer processing unit, the communication resources such as code modulation mode and radio frames sequential, in addition, except participating in Data Transmission Controlling, also participate in data transmission and processing, such as, for son to reception, data transmission and processing is from from each Physical Layer Service Data block (PSDU) of reception extracting data of physical layer processing unit and destination address corresponding to data block, and sends it to data transmission control unit; For son to transmission, data transmission and processing transmits from each PSDU of data transmission control unit and corresponding target address information data dispatch to different radio physical resource.
As shown in Figure 7, be the upstream data process path schematic diagram according to the embodiment of the present invention, idiographic flow comprises:
1) son receives radiofrequency signal from adjacent child node to antenna element 123, is transferred to son to radio frequency unit 122;
2) radiofrequency signal is converted to baseband signal to radio frequency unit 122 by son, and is transferred to son to physical layer processing unit 121;
3) son carries out demodulation, decode operation to physical layer processing unit 121 pairs of baseband signals, obtains the data in each physical channel, and is transferred to son to access control and processing unit 120;
4) extracting data that obtains to access control and processing unit 120 from each physical channel of son is from the single or multiple PSDU of child node, and Target id accordingly, and each PSDU and Target id are transferred to data transmission control unit 11;
5) data transmission control unit 11 is according to each PSDU and Target id, determines the routing direction of PSDU:
If the Target id of √ PSDU indicates this PSDU to mail to father node:
This PSDU and its Target id are then mail to father to access control and processing unit 130 by ■;
This PSDU and its Target id to be dispatched in different physical channels to access control and processing unit 130 by ■ father to be transmitted respectively;
■ father to after the data in different physical channel respectively coded modulation, sends to father to radio frequency unit 132 to physical layer processing unit 131;
If the Target id of √ PSDU indicates this PSDU to mail to processing locality unit 10:
This PSDU and its Target id are then mail to local data processing unit 10 by ■;
As can be seen here, the data retransmission of data acquisition physically based deformation layer (PHY) signaling between the different Transmit-Receive Units in the embodiment of the present invention, namely not be used in the destination address that MAC layer parses in MACPDU when data are forwarded by data transmission control unit and determine routing direction, but directly by from each Physical Layer Service Data block (PSDU) of reception extracting data of physical layer processing unit and destination address corresponding to data block, namely this destination address is transmitted by physical layer control signal, effectively reduces time delay.
Be illustrated in figure 8 the exemplary construction schematic diagram of a kind of tree network broadband multi-hop wireless communication system according to the embodiment of the present invention, adopt wired connection between control desk and node 0 (root node), between each node, adopt tree-like wireless network to connect.
Node 0 is unidirectional node (root node), comprises a son to wireless transmit/receive units, and the wireless signal realized between its child node (i.e. node 1) is received and dispatched;
Node 1, node 2, node 3, node 4 and node 5 is bidirectional nodes (intermediate node), all comprise a son to wireless transmit/receive units and a father to wireless transmit/receive units, the son of each node is respectively used to realize the double-direction radio signal transmitting and receiving between child node corresponding to it (node 2, node 3, node 8, node 5 and node 6) to wireless transmit/receive units; The father of each node is respectively used to realize the double-direction radio signal transmitting and receiving between its father node (node 0, node 1, node 2, node 1 and node 4) to wireless transmit/receive units, its neutron can adopt directional antenna to antenna element and father to antenna element, and lay in mode back-to-back, form banded covering;
Node 6, node 7 and node 8 is unidirectional node (end-node), all only comprises a father to wireless transmit/receive units, realizes the double-direction radio signal transmitting and receiving between respective father node (node 4, node 5 and node 3) respectively.
In the present invention, the data transmission control unit of each node, son are unify collaborative work when carrying out data transmission disposal to access and processing unit and father to access control and this three part of processing unit, are transmitted the destination address of PSDU by physical layer control signal; And the allocation of radio resources that each node communicates with between its child node or father node, code modulation mode select and the determination of the communication resource such as radio frames sequential is separate.
The present invention not only reduces relay data forward process time delay, and node can support Asynchronous operation mode with father to Transmit-Receive Unit to transmitting-receiving, reduces the synchronous requirement between multi-hop transmission network node, improves the reliability of Internet Transmission; And uplink and downlink are transmitted to the hop relay network of data throughout dynamic change, improve flexibility and the efficiency of relay transmission.
The present invention can support, with frequency and alien frequencies relay transmission, can carry out flexible configuration for various frequency spectrum resource application scenarios simultaneously.
Claims (6)
1. a data transfer control method for multi-hop wireless network, described wireless network comprises some radio nodes, and each radio node has adjacent child node and/or adjacent father node, wherein:
The described radio node down link data be adjacent between child node sends and uplink data reception is synchronous transmission;
Described radio node is adjacent downlink data receipt between father node and uplink data is sent as synchronous transmission;
Described radio node is adjacent the down link data that downlink data receipt between father node and this node be adjacent between child node and is sent as asynchronous transmission;
Described radio node is adjacent the uplink data that uplink data reception between child node and this node be adjacent between father node and is sent as asynchronous transmission;
Wherein, the radio frames stringent synchronization of the descending and up link between each node and its child node, comprise: described radio node is opened the down link data be adjacent between child node immediately and sent after completing the uplink data reception be adjacent between child node, and so repeatedly switches; Described radio node is opened the uplink data be adjacent between father node immediately and is sent after completing the downlink data receipt be adjacent between father node, and so repeatedly switches.
2. the method for claim 1, is characterized in that, described radio node is adjacent the downlink data receipt between father node, comprises the steps:
Described radio node, after receiving the down link data from father node, judges whether to need this data retransmission to its adjacent child node according to the datum target address comprised in the valid data received;
If need to forward, then the down link these data being put into this node sends buffer queue.
3. the method for claim 1, is characterized in that, the down link data that described radio node is adjacent between child node sends, and comprising:
If the down link of described radio node sends in buffer queue outgoing data, and the sending duration of outgoing data is no more than preset maximum value T
f_MAXtime, then down link is sent all outgoing data in buffer queue and send;
If the down link of described radio node sends in buffer queue outgoing data, and outgoing data sending duration exceedes preset maximum value T
f_MAXtime, then only down link is sent transmitting time in buffer queue and be no more than T
f_MAXpart outgoing data send;
If when the down link of described radio node sends in buffer queue and do not have outgoing data, then down link sends downlink synchronous signal, obtain down-going synchronous to make its child node.
4. the method for claim 1, is characterized in that, described radio node is adjacent the uplink data reception between child node, comprises the steps:
Described radio node, after receiving the uplink data from child node, judges whether to need this data retransmission to its adjacent father node according to the datum target address comprised in the valid data received;
If need to forward, then the up link these data being put into this node sends buffer queue.
5. the method for claim 1, is characterized in that, the uplink data that described radio node is adjacent between father node sends, and comprising:
If the up link of described radio node sends in buffer queue outgoing data, and the sending duration of outgoing data is no more than preset maximum value T
b_MAXtime, then up link is sent all outgoing data in buffer queue and send;
If the up link of described radio node sends in buffer queue outgoing data, and outgoing data sending duration exceedes preset maximum value T
b_MAXtime, then only up link is sent transmitting time in buffer queue and be no more than T
b_MAXpart outgoing data send;
If when the up link of described radio node sends in buffer queue and do not have outgoing data, then send uplink synchronizing signals by up link, obtain uplink synchronous to make its father node.
6. the method for claim 1, is characterized in that, described some radio nodes are with the tree-like or topological composition multi-hop wireless network of chain.
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| CN103402205B (en) * | 2013-07-29 | 2016-06-08 | 江苏中科羿链通信技术有限公司 | A kind of wireless tree network connection control method and apparatus for network node |
| CN105357140A (en) * | 2014-08-18 | 2016-02-24 | 中兴通讯股份有限公司 | Routing load sharing method and device |
| CN106851836B (en) * | 2017-01-12 | 2020-06-02 | 成都亿佰特电子科技有限公司 | Real-time efficient low-power-consumption wireless star networking method |
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| CN101277244A (en) * | 2008-05-08 | 2008-10-01 | 广东蓝鸽科技有限公司 | ATM synchronous Ethernet and method for transmitting/receiving data |
| CN101588628A (en) * | 2009-06-19 | 2009-11-25 | 山东省计算中心 | Clock synchronizing method for wireless sensor network |
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| CN101277244A (en) * | 2008-05-08 | 2008-10-01 | 广东蓝鸽科技有限公司 | ATM synchronous Ethernet and method for transmitting/receiving data |
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